package com.itheima.demo7;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class ReceiveMessageDemo1 {
    public static void main(String[] args) throws IOException {
        //接收数据

        //1.创建DatagramSocket对象（快递公司）
        //细节：
        //接收的时候一定要绑定端口
        //绑定的端口号必须与发送的端口保持一致
        DatagramSocket ds = new DatagramSocket(10086);


        //2.接收数据包
        //创建数组
        byte[] bytes = new byte[1024];
        //将数组打包用于接收数据
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length);

        //接收数据
        //receive该方法是堵塞的，程序会在此死等，直到收到发送端发送的消息
        while (true) {
            ds.receive(dp);

            //3.解析数据包
            byte[] data = dp.getData();
            int len = dp.getLength();
            String address = dp.getAddress().getHostAddress();
            int port = dp.getPort();


            System.out.println("该数据是从ip为："+address+"电脑的 "+port+" 端口发出的数据："+new String(data,0,len));


        }



    }
}
